You can download an app which will allow you to store files off line and transfer to your iPad. There are many of them: sugarsync, dropbox, evernote, etc. You could actually do this without an app, but that probably makes it easier. I have just started using some of these myself, so I cannot recommend anything, but you can read reviews online. You won't necessarily be able to transfer all file types.

Thanks for your solution. However, it is quite limit because it size and internet speed.Actually, my boss want to show customers our products image on his iPad. There are thousands of images and update every hour. We used IE on win xp or Vista to open the shared directory and can be easily searched. I try sugarsyn and there is no search function at all. Do other bro has any suggestion on my case?

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